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(No Model 3' P. H. KLEIN, Jr. ELEGTRIG ARO LAMP.

' No. 585,316. Patented-June 29, 1897.

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WITNESSES MW 94 01W...

PHILIP H. KLEIN, JR, OF NEW YORK, N. Y., ASSIGNOR TO THE GENERAL INGANDESCENT ARC LIGHT COMPANY, OF SAME PLACE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 585,316, dated June 29, 189 7. Application filed March 20, 1897. fierial No. 628,411. (No model.)

To aZZ whom it may concern;

Be 1t known that I, PHILIP HENRY KLEIN, Jr., a citizen of the United States, residing at I New York, State of New York, have invented new and useful Improvements in Arc-Lamps, of which the followingis a specification.

My invention consists of an improved apparatus for attaching the inner globe of an inclosed electric-arc lamp to the lower-carbon holder of said lamp, so that a practically airtight joint shall be made composed of the least number of parts, simple in arrangement, and easily placed in operative position and readily removable therefrom.

As is well known, the voltaic arc existing between the carbon points in an electric-arc lamp is inclosed in a small glass globe in that type of lamp known as the inclosed arclam p for the purpose of preventing the access of any considerable quantity of fresh air containing oxygen to the arc while in operation and otherwise protecting it from the action of air-currents. The form of so-called globe usually employed is not spherical, but elliptical in shape, havingboth ends tapered down to'a diameter somewhat less than the diameter at the central portion of said globe.

It is necessary to have some simple metallic attachment to the end of said globe by which it may be fastened to the lower-carbon holder in such manner as to produce a practically air-tight joint and which shall permit the expansion and contraction of the parts without cracking the glass and at the same time be capable of ready removal and reattachment in case of a breakage of the glass globe or other occasion for its renewal or cleaning.

My preferred form of apparatus for this purpose is illustrated in the accompanying sheet of drawings, in which Figure lisa vertically longitudinal section of such inclosing globe, lower-carbon holder, and attachment. Fig. 2 is a section in detail of the lower end of the globe with the thimble constituting my attaching apparatus. Fig. 3 is a detail View of the lower-carbon holder. Fig. 4 is a detail view of the lower part of my detachable two part thimble. Fig. 5 is a detail view of the upper half of the same.

Fig. 6 is a detail sectional View of the lower half of the globe, showing the upper half of the two-part thimble in position for withdrawal. Fig. 7 is a detailview of the carbonholder, showing a modified form of attachment for the thimble. Figs. 8 and 9 are detail views, respectively, of the two parts of my thimble with a modified method of attaching them one to the other.

Throughout the drawings like referencefigures refer to like parts.

1 represents the carbon-holder. 2 is any form of carbon-clamp within said carbonholder.

3 is the set-screw mounted in the carbonholder and pressing against the carbon-clamp.

4 is the lower carbon, and 5 the upper carbon, the latter passing through any suitable cover 6 for the upper end of the inner globe 7. I

8 (see Fig. 1) shows in cross-section the lower cross-bar of the lamp-frame in which the carbon-holder 1 is seated. V v

9 is the lower half of the two-part thimble by means of which the globe is attached to the lower-carbon holder. This rests on the packing-ring 10, of asbestos or other suitable" material, and in the form shown in Fig. 1 is attached to the carbonholder by means of the screw-thread 15, which meshes with the corresponding screw-thread 141 on the upper end of said carbon-holder.

11 is the upper half of said two-part thin] ble, having its outer end flared or extended, as shown at 12, while diametrically opposite portions 13 13 of said flared or extended portions are cut away in order to permit the withdrawal of the thimble through the end portion of the globe,which has a reduced diameter. This upper half of the two-part thimble has a screw-thread 16,which meshes with the thread 15 on the lower half.

17 is a packing-ring sustained on the annular flange or enlarged portion at the lower end of the part 9 of the two-part thimble, upon which packing-ring the lower end of the glass globe is forced by the drawing together of the two parts composing the said thimble.

18 represents a sliding cover for the bottomcarbon holder 1,whieh is pivoted at 19 thereto and may be slid back and forth for the removal of the lower carbon by the handle 20.

It is evident that the two parts of the thimble constituting the leading feature of myinvention may be attached one to the other by other means than the screw-threads shown. I have illustrated one instance of such alternative method of fastening, although many others will occur to those skilled in the art.

The form illustrated appears in Figs. 8 and 9 and consists of a form of what is commonly known as the bayonet-joint. The pin 22 on the lower half 9 of the thimble enters the slot 21 on the upper half 11 of the thimble and catches in the right-angled portion of said slot when the two parts of the thimble are twisted one upon the other in the wellknown way. The thimble thus formed might be screwed to the lower-carbon holder in the same manner as shown in Fig. 1, or it might also be attached to such lower-carbon holder by a similar bayonet-joint formed by the pin 24 on said lower-carbon holder engaging with the right-angled slot 23 in the lower half 9 of the two-part thimble.

Many similar Variations in the method of attachment might be worked out without departing from the broad idea of a two-part thimble which shall have enlarged ends, so that when the two parts are assembled in position they will bear against the inner side of that portion of the globe reduced in diameter and against the outer end thereof by virtue of such assembling of the parts and press against the glass globe with sufficient force to constitute a joint sufficiently air-tight for the purposes of an inclosed arc-lamp.

The method of operating my invention is evident from the foregoing description.

The upper half 11 of the two-part thimble, being turned so that its axis is at right angles to the axis of the glass globe, is introduced through the lower end of said glass globe, as shown in Fig. 6, the cut-away portions 13 13 allowing such admission. Then in place, the said partof the thimble is turned so thatits axis is parallel to or coincident with the axis of the globe. When the flaring part 12 comes to a seat on the in wardly-taperin g part of the glass globe, the lower half of the thimble 9 is then inserted in position and the two parts are assembled by fastening them together through the screw-threads 15 16, as shown in the preferred form of the invention, or by such other means of attachment as are illustrated in Figs. 8 and O or may be substituted therefor. This operation causes the two parts of the thimble to be drawn together until the upper enlarged end is securely seated against the inner tapering portion of the globe, while the packing-ring 17, carried by the outer enlarged end of the thimble,is forced up against the end of said glass globe. The thimble being thus in place, the same is attached to the lower-carbon holder 1 by screwing it to the thread 14 or by means of the bayonetjoint illustrated in Figs. 7 and S. This attachment forces the lower end of the thi mble down on the packingring 10 and completes the air-tight joint of the globe to the cross-bar 8 and lower-carbon holder 1.

In case the globe is broken and a new one must be inserted the thimble can be readily withdrawn by a lamp-cleaner by reversing the operations above described and reinserted in a new globe. No cement or other rigid fastening being employed, the parts may expand and contract under the varying condi tions of temperature consequent upon the lighting and extinguishing of the lamp and the change of seasons without fracturing the glass.

The advantages of the invention are evident, the same being simplicity, cheapness, compactness, and effectiveness.

It is evident that in the ordinary form of globe illustrated, in which both ends are tapered down, it is a difficult problem to design an arrangement of interior thimble which can be introduced,withdrawn, and made tight in position without the employment of tools or the use of cement. This my invention accomplishes in a most simple manner. Furthermore, the feature of the design of the parts of the thimble that it is entirely contained within the globe, excepting, of course, the enlarged lower part or flange which projects and bears against the end of the globe, all of which is an important part of my invention, results in a compactness of structure and a saving in material and in the length of the en tire apparatus,which constitutes a valuable improvement.

It is understood, of course, that the details of construction may vary without departing from the broad principle of the invention as herein set out.

Having therefore described my invention, what I claim as new, and desire to protect by Letters Patent, is

1. In combination with the supporting frame of an electric lamp, and a globe for said lamp, which globe has a portion with reduced diameter toward that extremity by which it is to be attached to the lamp-frame, of a two-part thimble located within said globe, provided with means of attachment to the lamp frame, and with enlarged ends which, when the said parts of the thimble are assembled in position, bear against the inner side of that portion of the globe reduced in diameter, and against the outer end respectively, substantially as described.

2. The combination of the supporting-frame of an electric lamp, and a globe for said lamp, which globe tapers toward that extremity by which it is to be attached to the lamp-frame, of a two-part thimble located within said globe, provided with a serew-thread by which it may be screwed onto the lamp-frame, and with enlarged ends which, when the said parts of the thimble are assembled in position, bear against the inner tapering portion of the globe and its outer end respectively, substantially as described.

3. In combination with the supportingframe of an electric lamp, and a globe for said lamp which globe has a portion reduced in diameter toward that extremity by which it is to be attached to the lamp-frame, of a two-part thimble located within said globe, provided with screw-threads by which said parts may be screwed together, and also provided with means by which said thimble may be attached to the lamp-frame, said thimble having enlarged ends, which when its parts are assembled in position, bear against the inner side of that portion of the globe which is reduced in diameter and against its outer end respectively, substantially as described.

4. In an electric lamp the combination of the frame, the globe which has that end by which it is to be attached to the frame reduced in diameter, and the two-part thimble by which said globe is to be attached to said frame, the inner part of said thimble being flared outwardly so as to bear against the inner side of that portion of the globe: which is reduced in diameter, when the axes of thimble and globe are parallel, but having diametrically opposite portions of said flaring part cut away to permit the passage of this part of the thimble into and out of the globe when its axis is turned at right angles to that of the globe, substantially as described.

5. In an arc-lamp a support for one of the carbons, a globe, a sheath screwing onto said support, and a fastener for said globe screwing onto said sheath, substantially as described.

In testimony whereof I affix my signature in the presence of two witnesses.

PHILIP H. KLEIN, JR.

WVitnesses:

HENRY J. HALL, HARRY E. BAILEY. 

